toolchain has been stripped down as far as I know how and executables compressed with upx(thanks BA's old consolvision post about shrinking his 3.0.4 toolchain)

Extract to /usr/local/dc

Kos has just the libraries precompiled. The toolchain has hardlinks to KOS directories under sh-elf/sh-elf/include, so either extract my KOS to /usr/local/dc , or move yours to /usr/local/dc/kos1.3 or create new hardlinks pointing to you KOS directory.